Shelving unit



FIG. 1 is a perspective view of a shelving unit showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a shelving unit, as shown. 